libstdc++
Variable templates for type traits.
Collaboration diagram for Variable templates for type traits.:
template<typename... _Bn>
constexpr bool std::conjunction_v
 
template<typename... _Bn>
constexpr bool std::disjunction_v
 
template<typename _Pp >
constexpr bool std::negation_v
 
template<typename _Tp >
constexpr bool std::is_void_v
 
template<typename _Tp >
constexpr bool std::is_null_pointer_v
 
template<typename _Tp >
constexpr bool std::is_integral_v
 
template<typename _Tp >
constexpr bool std::is_floating_point_v
 
template<typename _Tp >
constexpr bool std::is_array_v
 
template<typename _Tp >
constexpr bool std::is_pointer_v
 
template<typename _Tp >
constexpr bool std::is_lvalue_reference_v
 
template<typename _Tp >
constexpr bool std::is_rvalue_reference_v
 
template<typename _Tp >
constexpr bool std::is_member_object_pointer_v
 
template<typename _Tp >
constexpr bool std::is_member_function_pointer_v
 
template<typename _Tp >
constexpr bool std::is_enum_v
 
template<typename _Tp >
constexpr bool std::is_union_v
 
template<typename _Tp >
constexpr bool std::is_class_v
 
template<typename _Tp >
constexpr bool std::is_function_v
 
template<typename _Tp >
constexpr bool std::is_reference_v
 
template<typename _Tp >
constexpr bool std::is_arithmetic_v
 
template<typename _Tp >
constexpr bool std::is_fundamental_v
 
template<typename _Tp >
constexpr bool std::is_object_v
 
template<typename _Tp >
constexpr bool std::is_scalar_v
 
template<typename _Tp >
constexpr bool std::is_compound_v
 
template<typename _Tp >
constexpr bool std::is_member_pointer_v
 
template<typename _Tp >
constexpr bool std::is_const_v
 
template<typename _Tp >
constexpr bool std::is_volatile_v
 
template<typename _Tp >
constexpr bool std::is_trivial_v
 
template<typename _Tp >
constexpr bool std::is_trivially_copyable_v
 
template<typename _Tp >
constexpr bool std::is_standard_layout_v
 
template<typename _Tp >
constexpr bool std::is_pod_v
 
template<typename _Tp >
constexpr bool std::is_literal_type_v
 
template<typename _Tp >
constexpr bool std::is_empty_v
 
template<typename _Tp >
constexpr bool std::is_polymorphic_v
 
template<typename _Tp >
constexpr bool std::is_abstract_v
 
template<typename _Tp >
constexpr bool std::is_final_v
 
template<typename _Tp >
constexpr bool std::is_signed_v
 
template<typename _Tp >
constexpr bool std::is_unsigned_v
 
template<typename _Tp , typename... _Args>
constexpr bool std::is_constructible_v
 
template<typename _Tp >
constexpr bool std::is_default_constructible_v
 
template<typename _Tp >
constexpr bool std::is_copy_constructible_v
 
template<typename _Tp >
constexpr bool std::is_move_constructible_v
 
template<typename _Tp , typename _Up >
constexpr bool std::is_assignable_v
 
template<typename _Tp >
constexpr bool std::is_copy_assignable_v
 
template<typename _Tp >
constexpr bool std::is_move_assignable_v
 
template<typename _Tp >
constexpr bool std::is_destructible_v
 
template<typename _Tp , typename... _Args>
constexpr bool std::is_trivially_constructible_v
 
template<typename _Tp >
constexpr bool std::is_trivially_default_constructible_v
 
template<typename _Tp >
constexpr bool std::is_trivially_copy_constructible_v
 
template<typename _Tp >
constexpr bool std::is_trivially_move_constructible_v
 
template<typename _Tp , typename _Up >
constexpr bool std::is_trivially_assignable_v
 
template<typename _Tp >
constexpr bool std::is_trivially_copy_assignable_v
 
template<typename _Tp >
constexpr bool std::is_trivially_move_assignable_v
 
template<typename _Tp >
constexpr bool std::is_trivially_destructible_v
 
template<typename _Tp , typename... _Args>
constexpr bool std::is_nothrow_constructible_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_default_constructible_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_copy_constructible_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_move_constructible_v
 
template<typename _Tp , typename _Up >
constexpr bool std::is_nothrow_assignable_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_copy_assignable_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_move_assignable_v
 
template<typename _Tp >
constexpr bool std::is_nothrow_destructible_v
 
template<typename _Tp >
constexpr bool std::has_virtual_destructor_v
 
template<typename _Tp >
constexpr size_t std::alignment_of_v
 
template<typename _Tp >
constexpr size_t std::rank_v
 
template<typename _Tp , unsigned _Idx = 0>
constexpr size_t std::extent_v
 
template<typename _Tp , typename _Up >
constexpr bool std::is_same_v
 
template<typename _Base , typename _Derived >
constexpr bool std::is_base_of_v
 
template<typename _From , typename _To >
constexpr bool std::is_convertible_v
 
template<typename _Fn , typename... _Args>
constexpr bool std::is_invocable_v
 
template<typename _Fn , typename... _Args>
constexpr bool std::is_nothrow_invocable_v
 
template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool std::is_invocable_r_v
 
template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool std::is_nothrow_invocable_r_v
 

Detailed Description

The variable is_foo_v<T> is a boolean constant with the same value as the type trait is_foo<T>::value.

Since
C++17

Variable Documentation

◆ alignment_of_v

template<typename _Tp >
constexpr size_t std::alignment_of_v
inlineconstexpr

Definition at line 3243 of file std/type_traits.

◆ conjunction_v

template<typename... _Bn>
constexpr bool std::conjunction_v
inlineconstexpr

Definition at line 197 of file std/type_traits.

◆ disjunction_v

template<typename... _Bn>
constexpr bool std::disjunction_v
inlineconstexpr

Definition at line 200 of file std/type_traits.

◆ extent_v

template<typename _Tp , unsigned _Idx = 0>
constexpr size_t std::extent_v
inlineconstexpr

Definition at line 3247 of file std/type_traits.

◆ has_virtual_destructor_v

template<typename _Tp >
constexpr bool std::has_virtual_destructor_v
inlineconstexpr

Definition at line 3240 of file std/type_traits.

◆ is_abstract_v

template<typename _Tp >
constexpr bool std::is_abstract_v
inlineconstexpr

Definition at line 3164 of file std/type_traits.

◆ is_arithmetic_v

template<typename _Tp >
constexpr bool std::is_arithmetic_v
inlineconstexpr

Definition at line 3128 of file std/type_traits.

◆ is_array_v

template<typename _Tp >
constexpr bool std::is_array_v
inlineconstexpr

Definition at line 3102 of file std/type_traits.

◆ is_assignable_v

template<typename _Tp , typename _Up >
constexpr bool std::is_assignable_v
inlineconstexpr

Definition at line 3184 of file std/type_traits.

◆ is_base_of_v

template<typename _Base , typename _Derived >
constexpr bool std::is_base_of_v
inlineconstexpr

Definition at line 3256 of file std/type_traits.

◆ is_class_v

template<typename _Tp >
constexpr bool std::is_class_v
inlineconstexpr

Definition at line 3122 of file std/type_traits.

◆ is_compound_v

template<typename _Tp >
constexpr bool std::is_compound_v
inlineconstexpr

Definition at line 3136 of file std/type_traits.

◆ is_const_v

template<typename _Tp >
constexpr bool std::is_const_v
inlineconstexpr

Definition at line 3140 of file std/type_traits.

◆ is_constructible_v

template<typename _Tp , typename... _Args>
constexpr bool std::is_constructible_v
inlineconstexpr

Definition at line 3172 of file std/type_traits.

◆ is_convertible_v

template<typename _From , typename _To >
constexpr bool std::is_convertible_v
inlineconstexpr

Definition at line 3258 of file std/type_traits.

◆ is_copy_assignable_v

template<typename _Tp >
constexpr bool std::is_copy_assignable_v
inlineconstexpr

Definition at line 3186 of file std/type_traits.

◆ is_copy_constructible_v

template<typename _Tp >
constexpr bool std::is_copy_constructible_v
inlineconstexpr

Definition at line 3178 of file std/type_traits.

◆ is_default_constructible_v

template<typename _Tp >
constexpr bool std::is_default_constructible_v
inlineconstexpr

Definition at line 3175 of file std/type_traits.

◆ is_destructible_v

template<typename _Tp >
constexpr bool std::is_destructible_v
inlineconstexpr

Definition at line 3190 of file std/type_traits.

◆ is_empty_v

template<typename _Tp >
constexpr bool std::is_empty_v
inlineconstexpr

Definition at line 3160 of file std/type_traits.

◆ is_enum_v

template<typename _Tp >
constexpr bool std::is_enum_v
inlineconstexpr

Definition at line 3118 of file std/type_traits.

◆ is_final_v

template<typename _Tp >
constexpr bool std::is_final_v
inlineconstexpr

Definition at line 3166 of file std/type_traits.

◆ is_floating_point_v

template<typename _Tp >
constexpr bool std::is_floating_point_v
inlineconstexpr

Definition at line 3100 of file std/type_traits.

◆ is_function_v

template<typename _Tp >
constexpr bool std::is_function_v
inlineconstexpr

Definition at line 3124 of file std/type_traits.

◆ is_fundamental_v

template<typename _Tp >
constexpr bool std::is_fundamental_v
inlineconstexpr

Definition at line 3130 of file std/type_traits.

◆ is_integral_v

template<typename _Tp >
constexpr bool std::is_integral_v
inlineconstexpr

Definition at line 3098 of file std/type_traits.

◆ is_invocable_r_v

template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool std::is_invocable_r_v
inlineconstexpr

Definition at line 3265 of file std/type_traits.

◆ is_invocable_v

template<typename _Fn , typename... _Args>
constexpr bool std::is_invocable_v
inlineconstexpr

Definition at line 3260 of file std/type_traits.

◆ is_literal_type_v

template<typename _Tp >
constexpr bool std::is_literal_type_v
inlineconstexpr

Definition at line 3157 of file std/type_traits.

◆ is_lvalue_reference_v

template<typename _Tp >
constexpr bool std::is_lvalue_reference_v
inlineconstexpr

Definition at line 3106 of file std/type_traits.

◆ is_member_function_pointer_v

template<typename _Tp >
constexpr bool std::is_member_function_pointer_v
inlineconstexpr

Definition at line 3115 of file std/type_traits.

◆ is_member_object_pointer_v

template<typename _Tp >
constexpr bool std::is_member_object_pointer_v
inlineconstexpr

Definition at line 3112 of file std/type_traits.

◆ is_member_pointer_v

template<typename _Tp >
constexpr bool std::is_member_pointer_v
inlineconstexpr

Definition at line 3138 of file std/type_traits.

◆ is_move_assignable_v

template<typename _Tp >
constexpr bool std::is_move_assignable_v
inlineconstexpr

Definition at line 3188 of file std/type_traits.

◆ is_move_constructible_v

template<typename _Tp >
constexpr bool std::is_move_constructible_v
inlineconstexpr

Definition at line 3181 of file std/type_traits.

◆ is_nothrow_assignable_v

template<typename _Tp , typename _Up >
constexpr bool std::is_nothrow_assignable_v
inlineconstexpr

Definition at line 3228 of file std/type_traits.

◆ is_nothrow_constructible_v

template<typename _Tp , typename... _Args>
constexpr bool std::is_nothrow_constructible_v
inlineconstexpr

Definition at line 3216 of file std/type_traits.

◆ is_nothrow_copy_assignable_v

template<typename _Tp >
constexpr bool std::is_nothrow_copy_assignable_v
inlineconstexpr

Definition at line 3231 of file std/type_traits.

◆ is_nothrow_copy_constructible_v

template<typename _Tp >
constexpr bool std::is_nothrow_copy_constructible_v
inlineconstexpr

Definition at line 3222 of file std/type_traits.

◆ is_nothrow_default_constructible_v

template<typename _Tp >
constexpr bool std::is_nothrow_default_constructible_v
inlineconstexpr

Definition at line 3219 of file std/type_traits.

◆ is_nothrow_destructible_v

template<typename _Tp >
constexpr bool std::is_nothrow_destructible_v
inlineconstexpr

Definition at line 3237 of file std/type_traits.

◆ is_nothrow_invocable_r_v

template<typename _Ret , typename _Fn , typename... _Args>
constexpr bool std::is_nothrow_invocable_r_v
inlineconstexpr

Definition at line 3268 of file std/type_traits.

◆ is_nothrow_invocable_v

template<typename _Fn , typename... _Args>
constexpr bool std::is_nothrow_invocable_v
inlineconstexpr

Definition at line 3262 of file std/type_traits.

◆ is_nothrow_move_assignable_v

template<typename _Tp >
constexpr bool std::is_nothrow_move_assignable_v
inlineconstexpr

Definition at line 3234 of file std/type_traits.

◆ is_nothrow_move_constructible_v

template<typename _Tp >
constexpr bool std::is_nothrow_move_constructible_v
inlineconstexpr

Definition at line 3225 of file std/type_traits.

◆ is_null_pointer_v

template<typename _Tp >
constexpr bool std::is_null_pointer_v
inlineconstexpr

Definition at line 3096 of file std/type_traits.

◆ is_object_v

template<typename _Tp >
constexpr bool std::is_object_v
inlineconstexpr

Definition at line 3132 of file std/type_traits.

◆ is_pod_v

template<typename _Tp >
constexpr bool std::is_pod_v
inlineconstexpr

Definition at line 3154 of file std/type_traits.

◆ is_pointer_v

template<typename _Tp >
constexpr bool std::is_pointer_v
inlineconstexpr

Definition at line 3104 of file std/type_traits.

◆ is_polymorphic_v

template<typename _Tp >
constexpr bool std::is_polymorphic_v
inlineconstexpr

Definition at line 3162 of file std/type_traits.

◆ is_reference_v

template<typename _Tp >
constexpr bool std::is_reference_v
inlineconstexpr

Definition at line 3126 of file std/type_traits.

◆ is_rvalue_reference_v

template<typename _Tp >
constexpr bool std::is_rvalue_reference_v
inlineconstexpr

Definition at line 3109 of file std/type_traits.

◆ is_same_v

template<typename _Tp , typename _Up >
constexpr bool std::is_same_v
inlineconstexpr

Definition at line 3253 of file std/type_traits.

◆ is_scalar_v

template<typename _Tp >
constexpr bool std::is_scalar_v
inlineconstexpr

Definition at line 3134 of file std/type_traits.

◆ is_signed_v

template<typename _Tp >
constexpr bool std::is_signed_v
inlineconstexpr

Definition at line 3168 of file std/type_traits.

◆ is_standard_layout_v

template<typename _Tp >
constexpr bool std::is_standard_layout_v
inlineconstexpr

Definition at line 3149 of file std/type_traits.

◆ is_trivial_v

template<typename _Tp >
constexpr bool std::is_trivial_v
inlineconstexpr

Definition at line 3144 of file std/type_traits.

◆ is_trivially_assignable_v

template<typename _Tp , typename _Up >
constexpr bool std::is_trivially_assignable_v
inlineconstexpr

Definition at line 3204 of file std/type_traits.

◆ is_trivially_constructible_v

template<typename _Tp , typename... _Args>
constexpr bool std::is_trivially_constructible_v
inlineconstexpr

Definition at line 3192 of file std/type_traits.

◆ is_trivially_copy_assignable_v

template<typename _Tp >
constexpr bool std::is_trivially_copy_assignable_v
inlineconstexpr

Definition at line 3207 of file std/type_traits.

◆ is_trivially_copy_constructible_v

template<typename _Tp >
constexpr bool std::is_trivially_copy_constructible_v
inlineconstexpr

Definition at line 3198 of file std/type_traits.

◆ is_trivially_copyable_v

template<typename _Tp >
constexpr bool std::is_trivially_copyable_v
inlineconstexpr

Definition at line 3146 of file std/type_traits.

◆ is_trivially_default_constructible_v

template<typename _Tp >
constexpr bool std::is_trivially_default_constructible_v
inlineconstexpr

Definition at line 3195 of file std/type_traits.

◆ is_trivially_destructible_v

template<typename _Tp >
constexpr bool std::is_trivially_destructible_v
inlineconstexpr

Definition at line 3213 of file std/type_traits.

◆ is_trivially_move_assignable_v

template<typename _Tp >
constexpr bool std::is_trivially_move_assignable_v
inlineconstexpr

Definition at line 3210 of file std/type_traits.

◆ is_trivially_move_constructible_v

template<typename _Tp >
constexpr bool std::is_trivially_move_constructible_v
inlineconstexpr

Definition at line 3201 of file std/type_traits.

◆ is_union_v

template<typename _Tp >
constexpr bool std::is_union_v
inlineconstexpr

Definition at line 3120 of file std/type_traits.

◆ is_unsigned_v

template<typename _Tp >
constexpr bool std::is_unsigned_v
inlineconstexpr

Definition at line 3170 of file std/type_traits.

◆ is_void_v

template<typename _Tp >
constexpr bool std::is_void_v
inlineconstexpr

Definition at line 3094 of file std/type_traits.

◆ is_volatile_v

template<typename _Tp >
constexpr bool std::is_volatile_v
inlineconstexpr

Definition at line 3142 of file std/type_traits.

◆ negation_v

template<typename _Pp >
constexpr bool std::negation_v
inlineconstexpr

Definition at line 203 of file std/type_traits.

◆ rank_v

template<typename _Tp >
constexpr size_t std::rank_v
inlineconstexpr

Definition at line 3245 of file std/type_traits.